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' INVENTOR Patented Ma.y'17,1921.

A RTHUR E. DEMERS ATTORNEYS series.

ARTHUR EtDl-IMERS, OF SOUTHBRIDGE, IIZASSACI-IUSE'ITS, ASIGNOR T0 OPTICAL CGIVE?ANY, OF SOUTHBEIDG-IE, MASSACHUSETTS, A VQLUNTARY ASSOCIA- 'IION OF IVIASSACHUSETTS.

T 0 all whom it may concern: Y

Be-it known-that I, ARTHUR E. Damian's,

a citizen of Canada, residing at 3 South 'brid e, in the county of l/Vorcester and State of IV assac msetts, have invented certain new "and useful Improvements in Pitch-Pots, of

which thefollowing is a specification.

This invention'relates to improvements in pitch pots and has particular reference to a pot of this character especially adapted for use in connection with the blocking of ophthalmic lenses The leading object of the present invention is the provision of an improved form of pot which will facilitate the re-using of scrap and excess material and the quick and rapid softening or preparing in condition for use of fresh material without in any way interfering with or delayingthe blocking operations. 1

A further object of my invention is the provision of a novel and improved form of pitch pot which will insure usable thoroughly softened pitch only being accessible to the operator, and eliminate the supplying of lumpy improper material to the blocker.

A further object of the present invention is the provisionof an improved construction of device which may be readily applied to pots now in use to enable the advantages of my improvement to be obtained without altering or remodeling thereof.

Other objects and advantages of my improved construction should be readily apparent by reference to the following speclfication taken in connection wlth the accom panying drawings, and it will be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure I represents a plan view of a structure embodying my improvements.

II represents a vertical sectional view as on the line IIII of Fig. I.

Prior to my present invention it has been customary in the blocking of lenses or similar' work, to make use of a heated pot which will maintain the pitch in a soft or melted condition so that it may be readily applied to the blocks for the lenses, it being understood that this pitch is used for an adhesive for securing lenses to metal or other forms for subsequent grinding of the exposed por- Specification ofLetters Pat cnt. Patented lvla y 17, 1921, Application filed November 10,1919; Serial no saints,

r PITCH-roar.

men of thefglass, this securing process being commonly termed blocking; Thedifiiculty hitherto experienced has been dueto the. fact that with the ordinary heated pot the heat being applied to the exterior, the pitch along the material was exhausted and fresh material added, thefresh material would tend to float in the center of they pot away fromthe source of heat, thereby melting very slowly and continuously interfering with the ping out of the desired soft material.

into the pitch being ladled' out in the next operation and interfere with proper block: i

I have, therefore, provided my present structure to obviate these several difficulties, to cause the new pitch or'scraps of old pitch as supplied, to be brought nearer the source of heat and thus more rapidly heated so that the pot may be continuously fed and delays due to getting new pots of material or to melting an entire new pot eliminated. and at the same time to insure only 7 proper softened pitch beingsupplied for the block ing operation.

For an understanding of my improvement I would refer to the accompanying drawings, in which the numeral 1 designates the; table member having mounted thereinthe pitch pot 2 whose edge preferably rests on the gasket 3 sealing the steam chamber 4 by which the pot is kept in heated condition to h the edges would be in'good condition but as used, these scraps having a tendency to get i ing thelateral wings 8 resting on the top of the pot to limit the downward movement of the slide partition 7 so that a space 9 is provided between the bottom of the partition and the bottom of the pot. With this partition inserted within an ordinary pot, either with or without the guide ways 6 the lumps 10 of pitch may be placed on the one side of the partition which will hold'them relatively near the heated side of the pitch pot and prevent their floating to-the center and remaining therein a semi-fluid rather than a proper fluid condition, the new material all being added on one side of the partition, the weight of this material forcing the pitch from that side through the space 9 at the bottom of the partition into the opposite side of the pot from which the clear molten pitch may be dipped as required. To prevent excess waste during this dip-ping process the upper portion as at 11 projects slightly above the surface of the pot and provides a satisfactory central scraper on which the bottom of the dipper may be wiped as it is moved out of the pot to deliver the desired quantity of pitch.

From the foregoing description it will be seen that I have provided an improved partition device applicable to old or new pitch pots, which will divide the pot into two sections, one for the material being added and to be softened, and the other for the softened usable portion of the material, and which in addition provides a satisfactory scraper or wiper to remove the Waste pitch from the bottom of the dipper being employed.

I claim:

1. An optical pitchpot comprising a container for the pitch, an inclosing member providing a heating chamber therefor encircling the container, said container having an exteriorly flared portion interlocking withthe inclosing member and having interiorly projecting ribs and a combination partition and scraper member having a depending portion spanning the pot and slidably received between the ribs and having laterally projecting portions engaging the flaring edge of the pot for limiting the downward movement of the partition, said member being further provided with an upwardly projecting scraper portion, substantially as illustrated.

2. A combined partition and scraper for a pitch pot comprising a main partition portion of size to substantially fit the pot transversely thereof, lateral projections adapted to engage the edges of the pot to support the partition in spaced relation to the bottom of the pot, and a central portion projecting above the pitch level toprovide a scrapen' In testimony whereofI have-afiixed my signature inpresence of two witnesses.

ARTHUR E. DEMERS,

Witnesses: V

H. K. PARSONS, Anion Gr. HASKELL. 

